Structural Strength Stability

1. Structural Strength & Stability Types of Structures Date:

2. Structural Strength & Stability What is a structure? What are some example of structures? Can you think of structures that are natural? What makes a structure strong and stable? What do you think stability depends on? Ex of structure � buildings, car, airplane, knapsacks, bags, etc Ex of natural structures � plant, eye, bee hive, our bodies, beaver dams, nests What makes a structure strong and stable? A structure is stable if it remains on it�s base, undamaged, when acted upon by forces it is designed to withstand Stability depends on 1. the materials it�s made of, 2. how the materials are arranged, 3. how the structure�s mass is distributed Ex of structure � buildings, car, airplane, knapsacks, bags, etc Ex of natural structures � plant, eye, bee hive, our bodies, beaver dams, nests What makes a structure strong and stable? A structure is stable if it remains on it�s base, undamaged, when acted upon by forces it is designed to withstand Stability depends on 1. the materials it�s made of, 2. how the materials are arranged, 3. how the structure�s mass is distributed

3. Structure and Stability Structures are designed to perform a specific function. What are some these functions? In performing this function, a structure is exposed to forces. These forces can make the structure fail. What are some of these forces? Carry things, homes, �. Weight of people/ things, wind, gravity, erosion, water �.Carry things, homes, �. Weight of people/ things, wind, gravity, erosion, water �.

4. Different Structural Designs When designers are creating a product, whether it�s a building, a CD rack, or a jungle gym for a playground, they must start by assessing the forces that will work on the structure or product. Then, they must decide which type of structure works best to handle the loads (the forces that will act upon the product)

5. Today�s Class Work Read through �Types of Structures� Work on the �Classification Activity� When complete� Hand �Types of Structures� back into Ms Mayner, and keep your activity sheet. We will take it up When you are finished� Pick up a copy of today�s note, read it, and staple it into your notebook Date the note at the top and underline it Add to your table of contents Begin tonight�s homework

6. Combination Structures Because each type of structure has it�s advantages, they are often used in combination with each other. An umbrella is a frame- shell structure (frame is the metal part, shell is the water proof part) Most buildings are solid- frame- shell structures (the foundation and other supports are solid; a frame of steel supports the outer shell of brick or cement)